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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2065d8585954f0cb558b3fb6be1d516c83db02dc963731c0001e72516b2f331d' 
  AND token = 'FCNA7fszF60o1FubseYKKS3OE5ge8o8UKp9KVZ9Kbew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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