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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6707c666e7cf3d2cc7d2f96cdc678b8067c071d0b78bf027337385fc829d504d' 
  AND token = 'j4LhbcbjYBaAP6dnp1oUX1uicQhboR1Pj8i1rjVrOGQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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