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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc0b63d14ab763c333fcce8581a6ae6a0252d0c637de48a8db6bb07c6a7427ca' 
  AND token = 'CyReot2U0YNGUdahtyrfWwj7K0ijxCL6f8/enrZT1a8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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