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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4dc284941fdb5e7d00d0d1dfb6eaaac2793611e45d3b1a547b8ac8efb9dbc768' 
  AND token = 'hDtJ+sPl8AVc5Z/TW6wsiAvbXaMx71wCSOJaNI8+xaE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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