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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c8b088f5605414e0dedf7ed549bd805c23205a7b3f75adf6708c97cf0ce0465' 
  AND token = 'I7Fi9TJxXvH2D5xAAWrvDFtVDWhqLw9Q/rCTj3fkqqg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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