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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7832fcdf6e31d95d21ea6e59417245640cd3823287d448c936078de0ed7a4eba' 
  AND token = 'yAHC39OlNynRPMKTxk2wevO9kvfwH9GfZ5Y4aXrBhLg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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