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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a63ede061b1b9d868ddf16381607446c777ceb972f3b61c44b5709f9064628a' 
  AND token = '5xG966A204E5riIly4vaFga4+ovZsnip/Dc+DybquH0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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