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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be6231d6be77102ba0fbef2ac8d8ed54a5b30d31515b61dbc4e95c2283732af8' 
  AND token = 'jJtLP1ahjCWdkqk5VjKSpkqNemMdZ+3G6elS13LfFvM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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