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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '915ec72365e1a4cc9b19d2778f343293727c1a3ae45fddc92954dc3a91f2211f' 
  AND token = 'bAWVDDPuUdyFiGd3rxXKjLfEj/TpbgObO68SutGdMoQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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