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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f01d2c211f093ef4d79312c1ff635a5f132e9d83493a35698847890837c643e2' 
  AND token = 'pMkTE/wsrkR2a7j3/lHEY9FvctUNzzO7iZSCvkOWdYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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