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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '606acf1b72cc8248d1e7e46d4063301a007091582ec81a68ac46e9d0c0fb5cce' 
  AND token = '0YFMIatQ32Iq8tROPx/ba12bPOXb5GhrwLDpc0BljoA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00098

JSON explain

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