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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '924edd06e0448f01b41856fbdf96ea248b2b36869d34009d5eb337d7fd7cc7af' 
  AND token = 'UFFj/RdL1CCc1ZMqSZqj+8/fn0fuP2X/xcxs0IzIS4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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