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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b855388afd9f851238be48e80810e6c6a52b592cd114775a7f1a11284108f56' 
  AND token = '2pjIX59X/BWMqVdkmigdMjflat0i8QlHyE0sgU7rvWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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