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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c393efc5b5dbe32d5cf495fd47e4a956d47f7df50eedcfe7b143881ecf7c5a8f' 
  AND token = 'QWR1NVQWohAy2WYML1GW/6LmMfAucpIERESaHO4X5Zo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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