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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b30ead2e954b04f6bf4423f88d0c754d0cd57e5a6899cbc0809e650c374b1f99' 
  AND token = 'u8x8Ct/0KRV0BYINT/hPLfR7FHZhS6nSgCmEst9Eg8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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