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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8a1029229edabd548cf1dea4818d5d18dcd16512709738fc12d77c009ea1d9f' 
  AND token = 'L9UtNOlFruCKjr5T+YeNZ99SksJ/ct0jQmqocpkw5c4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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