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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '028ca7ed74a37f6df88559e0ad7c2fc1a3cc0932a0ec2d61bf2ecf6817ca1633' 
  AND token = 'mKCFxcqW2yvrGsfieKkoABOuT5f6vNcqkfW6eLfjKD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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