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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47d6d6b5a1afe3cc9b208de9cdd8715e55411cf8f37f1375c4e954670bd52aff' 
  AND token = 'E9G735b0yTtI/RLN4eQe3HMDjbLwz/QAnoBLc0cEs1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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