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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09ce03bd7d192e11b17648e876aa31d53d98aee358d37e42446fb7a80c3ba050' 
  AND token = 's8QcFbPYUOPeX6TQ1IaQKc/vHYkhsz5RkIMh4EO+sis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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