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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '041370539480359af0deff39c828aefdc6555fcefca0ad79792c922d5b5133dd' 
  AND token = '55sJAfCLChcaPD5IIa8bK4TacV9VLDKZ0jaxGrXCuq4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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