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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb6b119b8a1067cb6855a9995992576a95a94c4d3cb8cac88919ded400b1998f' 
  AND token = 'inKAn6x2YCmB/OgUjUyF36FRwLtB5Z8W126N8q+vGiE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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