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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6582c2d1c2bba29b1afb1a55b0c2034664699a2a463e71ac30fa663857780a91' 
  AND token = 'FwOXlOLwJgg6c5aHhvaQFkwbn9W8Xo9l/MwJwwXzqLg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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