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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63fc5d4ce3cfb2f7949409511c6a8ed174ded83ab984c8e06bb502188cb1f78c' 
  AND token = 'oiEz0WIJMAg5n3P3Wqk+bbE7TdordmMwMRso2B+/1JE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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