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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4110253cd1ec88b335a1895240a05994ec3da4e3850920faf387f544be7e59b1' 
  AND token = 'xXS9BL5JOPoopKdk8g98G7p//mhk/3IUu32d1g/rhTc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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