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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da7fc287312f99235009f7c3fd0ab1c5b1b57a97a90d2ac32cc6b3fe156c21d3' 
  AND token = 't+512oiDrfjM9Znm/UxzSgfwB3etCV3riB4pXo516Tw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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