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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06fa17442d926a7ee6bef2d6e095fd1c0cd71a9cc52b3594d98069ef0d72667b' 
  AND token = 'OonCeF7+VCsHrdCtXGfGI9dJntH0c9vBErEevSrD8Vs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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