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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd809254569ad4e12cf1f3195b41e34920ab5eae2e8fda70453d21b3de8c3ecfd' 
  AND token = 'x1KaXxWgVt0Hh9e+XVP4LyV6P9Gj5IIITSbLlod8MKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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