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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd99ddd3498941c03dbb3eca8a0fddcdad675d84f7f5be2148b962419e69973ff' 
  AND token = '37JlKs2BQ34+3W1DaxXWcITy7iNbXV3qFK0fs7zM19o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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