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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd92fa6763fe859259c017f11d23689751e4d6efd20ee8108d5d0d4f19e5b8167' 
  AND token = 'ZyLiPfzljCFH3E5FaOXBnHjF6z0+yZ+0OVGfAcwbLUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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