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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5811f3a0fd6e73d7f296c136fe9d6e267ebf409769ccfee3f35340179b6110d4' 
  AND token = 'TP133abYei91GTy3iAeAkz5Xd158p9nLHNncNa9KdC8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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