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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79a8930ba653a931886ecd76aaf529b2eea975ca7d2511fd2c2b013c6eaf8ccf' 
  AND token = 'ub3bnLP5lJa4ifnsBfYM+4fuR3px7qWjxYV6n40eujY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}