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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f5c13b7b20c35193408d0c1c48760b83096f118a004172f105efdc84e6ed0b9' 
  AND token = 'YGWvzGbNBhukzsWQ5n3nMDrTY/aVX0ODAv6iG0SNrEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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