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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'deb67b332460fce2aa845b6f1a298941ec1694b9c75f3d5a890b720dc6f0926b' 
  AND token = 'UcKj0zAo+oxxAhupa0CsVVBNFmPgPa/taVTuyrE7yLU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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