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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10d01071d0783c5202a4bf9bfcc14c78ec6887051a831d795289727ab3555b92' 
  AND token = 'B65J/EsMXXay9u3PX4klxjozBGc2Mkxq8wSkFJeqyf4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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