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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb096c86d42d6c835ca15af81f0a447aa476794d1d7530ad86ff47877bf7da9f' 
  AND token = 'v5c8dJ6YrGILp+AUH8mNB/Fo27G2KbYk/sc8NFWpO6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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