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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f620709811067a5fdd2bc411d85d91a4448e5ccf94d4890d480a3db4e9b1ad3e' 
  AND token = 'YwfrmXxWgaTAaNSYn+M+v2jAIUjjsAyJP3kFTSwex/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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