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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '324294b9a4598b238fc2b3d91aa3aceadc1bc96190c5b8b8bcf4e98bbfc496f3' 
  AND token = 'sHMyLFk0g+E9R6RbsVp/I3JW40ShZiM2iym96vR002k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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