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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47b9be5f14672ffcd8428981d568d9df85fcd89a3756841e46db65daa178ad95' 
  AND token = 'TyudbC1B30E1GXuL5sUe5/Oe6Nvqs+/0wCjtOcE0rBY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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