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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e951d2c63679d1218043e8af4c15ed0871bd4b55f735b8c2d3f4cfb6ce6554e9' 
  AND token = 'QnDpyFZ2Fpf7J6jdaMTihXzu0jaVjiA25jhLYm5QldA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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