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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30a599c0e7b7f8fd6181b298cd15fbf002157b39ae8803889094f560f4cae83d' 
  AND token = '2S2XxMst2PUz70j55z65n/HOnDLMqBtK5Y+1eS7HDXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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