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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74524d078ab9febd5adcd2edd8e6aa0640a7f2f3ab3c8bd108e953665af048a9' 
  AND token = '/RwiARO1u9zZbwR6t+bRlthFSWeqeJBnntjoOwf4z3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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