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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d8511ab4b7bc8586f9217304de11741c765e5607d4ef5cef992871ca5b9e226' 
  AND token = '8/vS55Ai5TOeZCE1UxwN7kE1eB7qGsPEyI1WpB+4r10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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