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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1705d199f58f449521b5e13b2720e6268810d8b0630e95bb64aed7cea4d2a0d3' 
  AND token = 'N9ZjCTgzZ9Y6br6kjIYZV8O2uzMH8qo2AEK7U4GjrmM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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