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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78bb0039dc7d29f1d7f7f108432aeaa5822aff2fe64e9e771b8f871070bf75dc' 
  AND token = 'RDQBfPYhXK/FOHREa6vulgYyFKkE+Hpgfa+vucSz3vU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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