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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '828e8db6d07d432b57e65d358d4391111bc2f51dbb95c285518a829e1b10ce9b' 
  AND token = 'mSR3iuYstQGzThs8GiFONnSzSVj8XBmDSAuWhyS0/MI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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