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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '717ad24da2f9114065920acbff6487f140c2b70b215e67c8229c1fbfde95f8eb' 
  AND token = 'ZI5dobIqxiN9e0q/WjAUznfPIX3W0pWioL/HPfsukC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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