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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62163ac589359d4c925b12fe592aecc9fd7d2f6fb1a117298845ae619217e230' 
  AND token = 'x6f21/RUYr16mncv3wOEkjkkOtdW32spnN9318CkdNE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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