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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fddaf5305b86d93a845fa9fd38cc03a91a3629a21f202d8122fbdf0902cdfb3b' 
  AND token = '5JDYX4hPEYoTyVwGbmoqfvKTc8ffZEacZbywKA/FWKA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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