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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e5de992bf671f91f9c480df551dc55fca36aea09bf8d97e719193b2ed26d90b' 
  AND token = 'tqrJ/MNdVWBv14x3qAaT/+3akgBaojwM3r0tDHb2auA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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