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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd04a8bc1e3811036c112199d2b052c2845eb157a02c2be9efd6b5e62a770434b' 
  AND token = 'Ku2TelrXyqDgoQo/2rxs8APPbyuzsm04roz8CyHvLu4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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