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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a983a04286f86db9255058166288072a39089c8ab0695a58d6449d70c0ad4ead' 
  AND token = 'mRP5VoUWTNye9B1HI4ui4/VOqFHiEZ5KsFR3XnQHEcI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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