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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e3e74adf950fb530a1bb40ee0a26098efa7df0218dc5ba8276ebf4ad18c86b7' 
  AND token = '5ADo3+ZiKWs5P59A55ddFsz1Fs3aBubpfju+xXcXX5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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