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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca08857ee1e773068acce15a16c11a5c0176795241f1d7dbd08db0d802762bd9' 
  AND token = 'gaoqPbvJurnR/vsQ6tnL+pit4lNpXs4v3XxyYvH5ZMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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