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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af65116b01f729669efc57756b2c2bf893d9c22dd610822bfc4479bb301bf18d' 
  AND token = 'lHks+RzCE6cOwW8iOnBDvkNeCbN4Vyw9qq28gw368gI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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