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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6d385d714097823c917b5d723798a8dc143cdc915600f3ac99e66fd3385cf69' 
  AND token = 'AdmTWy/EeHTKkCneXM9VqrtDQy0X2qJb/Jh15u8o9jY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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