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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '167d41d2e76c477edd88d2dfd2af45d97f6a70c1f6793c8da42be4a153dee164' 
  AND token = 'nRfzGDuPs83yCeu/cAQ28tQmjOF7/1FFZmO2QflLxGE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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