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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a35ccd09448fcd287f6970b50cca203679ae417902e127e63d6ee1670fd0aca' 
  AND token = 'tH+xvOlX6CoY9LZyM8Prhewb4Cqv+XihLMoLC5hnL3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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