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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fed007583df1d4aaabf28b9d37098c58f4313603ab11509e6c4737c16295367a' 
  AND token = '2E0a9kZwQ5Dqszu3FuaJGel7G3npVmije7vBt0wRJJs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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