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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfc5483a9feab5dd3cbb561d4a30cafb2ba2e059ab9b64dd096bb3a45502fe20' 
  AND token = 'GvPJuX0WJSH4wvpV7shxEkMsBwFXTlsMnNucSfFYYe8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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