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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64a7dbece7d6d8799af69c38ba99455c6da4351803af142262830f8b52edd3a5' 
  AND token = 'C8kMEuBZegd7eLDzFM163IbHro2q5uvaQdzM08MYY4Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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