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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d1c4ddd8995e3edef07edfa331facbca8ca1914cc214f1e523c6785831a56cf' 
  AND token = 'esAgjcQTN88/0ieFzumGeS3H9B75Unw6zy2QBiM19T8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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