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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f20bb978a9d94987414348ae5168de8da3bbe95ae2ffcf020c43b4eee8f909cd' 
  AND token = 'E8ExkMoymXaalhm82xeEro/GVap/cWe/uiNzVrondZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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